Dental drill



(Model.)

R. M. ROSS.'

. DENTAL DRILL. 4

No. 810,467. .Y Patented Jan. 6.1885.

INVENTOR Qq@ @JZ/- @44,

D0/0 BY mi 5, I y @www ,AT ORNEYS sectional view taken on line a 0r, Fig. 2.

lINrTn STATES PATENT OFFICE..

ROBERT M. ROSS, OF UTIOA, NEV YORK.

DENTAL DRiLL.

SPECIFICATION forming part of Letters Patent No. 310,467, dated January 6, 1885.

Application led September '29, 1884. (Model.)

To all whom, it may concern,.-

Be it known that I, ROBERT M. Ross, a citizen of the United States, residing at Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Dental Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as'will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure l of the drawings is a side view of my device. Fig. 2 is a vertical sectional view of the same. Fig. 3 is a side view of the part B detached from the drill. Fig. 4t is a cross Fig. 5 is a cross-section taken on line y y, Fig. 2; and Fig. 6 is also a cross-section taken on line .e e, Fig. 3.

This invention is a dental drilling device for making and shaping the cavities in filling teeth; and it consists, essentially, in a novel and useful mode of securing the drill-point to the drill-spindle.

It further consists of certain details of construction of the bushes for the spindle, the cover for thesame, and other parts, herein after more fully described.

In the accompanying drawings, A represents the shaft or spindle of the drill, having one end, c, hollowed longitudinally for the insertion of the drilbpoint, hereinafter described. The pointed end of the spindle is made rounded, and the steel bush of the drillpoint is bored out round so as to fit the rounded end of the spindle.

B is a sleeve turning on the spindle and provided with the milled head b.

b is a milled head similar to b, but lxed upon the spindle A by means of a short sleeve, Z22, and a proper setscrew. The sleeve b2 bears against the milled head band keeps the sleeve B in place.

fI)3 is a collar secured and made adjustable longitudinally upon the spindle by a setscrew, and serving to take up the lengthwise wear of the drill-spindle.

The lower end of the sleeve B, or end opposite its milled head, is provided with cogs or teeth bt, which extend for a short distance around the circumference of the same. The said teeth lie longitudinally and form a rack, which engages and turns the pinion C when the sleeve Bis turned on the spindle. The pinion C has fixed centrally to its lower or inner surface a screw, c, which engages an internally-threaded opening, c, in the spindle A, running through the hollowed end a thereof. The point of the screw is eonefshaped, and, being of hardened steel, embeds itself in the shank of the drill, which is of softer metal.

D is any proper drill-point, having its end d inserted into the hollowed end a of the spin dle, so that the end of the screw c can bear upon it and retain it within the same. The drill-point commonly used with the device has its shank rounded or smooth.

Turning the sleeve in one direction fastens the drill by means of the rack, pinion, and screw c, while turning it in the other direction releases the drill. In turning the sleeve the fixed milled head Z1 is held in one hand,while the sleeve is turned by the other.

E is a cover surrounding the drill-spindle, and having its lower or drill-point end made smaller than the opposite end. Into the drillpoint end is screwed the steel bushing e, having a proper central longitudinal opening, and serving as the lower bearing for the drillspindle,which enters the enlarged rear end of its opening. The said bushing is split longitudinally for about one-half its length on opposite sides, and has a set-screw, e', engaging through a proper opening in the cover E, and bearing upon it midway between the splits, so as to take up the wear of the drill-spindle sidewise.

c2 e2 are opposite openings in the cover E, by means of which access is had to the milled head b; and c3 c3 are similar openings for access to the milled head b of the sleeve B. The upper end of cover E is open, and has fitted into it, over the drill-spindle, a plug, F, carrying a steel bushing, f, similar in construction to the bushing c, and similarly controlled by a set-screw, f. This bushing serves as the upper bearing of the spindle, and extends out thereby about one thirty-second of an inch from the front end of the plug, bearing against the rear end of the collar b3.

f2 is an externally-threaded extension from the plug F, for a purpose hereinafter eX- IOO plained, and f3 is a set-screw, by means of which and a slot, fi, in the edge of the cover E the plug F is secured to the latter.

Gis a sleeve slipping over the cover E, so as t0 close the openings e2 and cs and prevent the hands of the operator interfering with the rotation of the milled heads b and b. It also serves to keep out dust, &c., from the drillspindle. The part of the cover E below the sleeve G is suitably roughcned or milled to make a hand-hold.

H is a milled head screwing down on the extension f2, and having swiveled to its outer end the internallythreaded tube h, into theY outer end of which is secured the iexible tubing through which the drill-spindle is operated.

The working is vfully evident from the foregoing description of its construction.

It is evident that by releasing the screw f from the slotf7i in the cover E all the interior parts maybe removed from such cover. rlhe said screw thus serves to hold I[he device to gether with its parts in proper relation to each other.

Having thus described my invention, what I claim as new, and desire to secure by Letters l Patent, is-

l.. ln a dental drill7 the combination, with the cover E, plug F, and screw f, of the drillspindle A, steel bushings e and f, and set-screw e', substantially as specified.

2. In a dental drill, the combination, with the spindle A, of the pinion C, screw c, and sleeve B, provided with the milled head I) and teeth b", substantially as specified.

3. ln a dental drill, the combination ofthe spindle A, sleeve l5, and cover E with the collar Z1, milled head b, sleeve b2, pinion C, and screw c, substantially as specified.

ln testimony whereof I affix my signature in presence of two witnesses.

ROBERT M. ROSS.

lVitnesscs:

VILLIAM J. BROWN, CHARLES l). Hnns. 

